| dc.creator | Teixeira, A. V. | |
| dc.creator | Geissler, E. | |
| dc.creator | Licinio, P. | |
| dc.date | 2018-04-20T14:41:31Z | |
| dc.date | 2018-04-20T14:41:31Z | |
| dc.date | 2006-09-22 | |
| dc.date.accessioned | 2023-09-27T21:29:01Z | |
| dc.date.available | 2023-09-27T21:29:01Z | |
| dc.identifier | 1520-5207 | |
| dc.identifier | https://pubs.acs.org/doi/abs/10.1021/jp064338c | |
| dc.identifier | http://www.locus.ufv.br/handle/123456789/18951 | |
| dc.identifier.uri | https://repositorioslatinoamericanos.uchile.cl/handle/2250/8961381 | |
| dc.description | We present dynamic light scattering (DLS) measurements of soft poly(methyl-methacrylate) (PMMA) and polyacrylamide (PA) polymer gels prepared with trapped bodies (latex spheres or magnetic nanoparticles). We show that the anomalous diffusivity of the trapped particles can be analyzed in terms of a fractal Gaussian network gel model for the entire time range probed by DLS technique. This model is a generalization of the Rouse model for linear chains extended for structures with power law network connectivity scaling, which includes both percolating and uniform bulk gel limits. For a dilute dispersion of strongly scattering particles trapped in a gel, the scattered electric field correlation function at small wavevector ideally probes self-diffusion of gel portions imprisoning the particles. Our results show that the time-dependent diffusion coefficients calculated from the correlation functions change from a free diffusion regime at short times to an anomalous subdiffusive regime at long times (increasingly arrested displacement). The characteristic time of transition between these regimes depends on scattering vector as ∼q-2, while the time decay power exponent tends to the value expected for a bulk network at small q. The diffusion curves for all scattering vectors and all samples were scaled to a single master curve. | |
| dc.format | pdf | |
| dc.format | application/pdf | |
| dc.language | eng | |
| dc.publisher | The Journal of Physical Chemistry B | |
| dc.relation | v. 111, n. 2, p. 340–344, dec. 2007 | |
| dc.rights | American Chemical Society | |
| dc.subject | Dynamic scaling | |
| dc.subject | Polymer gels | |
| dc.subject | Comprising nanoparticles | |
| dc.title | Dynamic scaling of polymer gels comprising nanoparticles | |
| dc.type | Artigo | |
